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Polyolefins and method for the production thereof

Inactive Publication Date: 2003-07-01
ADDCOMP HOLLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of these functional graftable monomers which have not reacted with the polyolefins, that is to say which have not been grafted onto the polyolefins after step a), may be responsible inter alia for insufficient melt strength and for colour problems.

Method used

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  • Polyolefins and method for the production thereof
  • Polyolefins and method for the production thereof
  • Polyolefins and method for the production thereof

Examples

Experimental program
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Embodiment Construction

The resin used is an ethylene-propylene random copolymer sold under the trademark ELTEX.RTM. P KS 001 PF and is characterized by:

an MFI (melt flow index measured according to the ASTM D 1238 (1986) standard at 230.degree. C. under a load of 2.16 kg) of 4.5 dg / min.;

a melting point of 134.degree. C. (measured using the technique of DSC (Differential Scanning Calorimetry) according to the ISO FDIS 11357-3 (1999) standard, at the second pass and with a scan rate of 10 K / min.); and

a total C2 content (measured by infrared spectrometry) of 4.6%.

The resin is fed into the extruder at a rate of 5 kg / h.

The extruder is a CLEXTRAL BC21 corotating twin-screw extruder. The diameter of the screws is 25 mm and their length is 1200 mm. The speed of rotation of the screws is 300 rpm (rotations per minute). The barrel consists of 12 barrel segments (zones) each having a separate temperature control.

The 12 zones are respectively:

1. feed zone, the resin being fed via a hopper at a rate of 5 kg / h and the ...

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Abstract

Process for producing polyolefins, comprising the following steps:a) grafting of acid groups onto polyolefins by means of a graftable monomer bearing at least one functional group chosen from a carbonyl and an acid anhydride, optionally in the presence of another graftable monomer bearing a vinyl unsaturated group and, optionally, one or more aromatic rings;b) purification, consisting in removing at least some of the graftable monomer bearing at least one functional group chosen from a carbonyl and an acid anhydride that has not reacted with the polyolefins;c) neutralization of the acid groups by at least one neutralizing agent.Polyolefin obtained.

Description

1. Field of the InventionThe present invention relates to a process for producing polyolefins having special rheological and compatibilization properties, as well as to the resulting polyolefins and to their use.The problems that arise with polymers in general, and polyolefins in particular, relate to their insufficient melt strength when they are being processed by extrusion.It is well known that the melt strength of polyethylene (PE) and of polypropylene (PP), which is defined by a high elongational viscosity, is insufficient in certain types of processing, such as extrusion foaming, extrusion blow-moulding, thermoforming and blow moulding, particularly 3D blow moulding.Solutions proposed for solving this problem consist in making the macromolecular structure of the PE or PP branched by creating covalent bonds between the macromolecules. However, in practice, branched resins manufactured by covalent coupling all suffer from a tendency of the branches to degrade due to the effect o...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F255/00B29C48/03B29K23/00B29K105/04B29K105/16C08F8/44C08F8/46
CPCC08F255/02C08F220/00C08F222/06C08F6/001C08F6/02
Inventor GAUTHY, FERNAND
Owner ADDCOMP HOLLAND
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